package com.leyuan.base.controller;

import com.google.code.kaptcha.Constants;
import com.leyuan.base.config.Captcha;
import com.leyuan.base.config.CaptchaCreator;
import com.leyuan.common.core.controller.BaseController;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 图片验证码（支持算术形式）
 *
 * @author ruoyi
 */
@Controller
@RequestMapping("/captcha")
public class SysCaptchaController extends BaseController {

    @Autowired
    CaptchaCreator captchaCreator;

    /**
     * 验证码生成
     */
    @GetMapping(value = "/captchaImage")
    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) {
        ServletOutputStream out = null;
        try {
            HttpSession session = request.getSession();
            response.setDateHeader("Expires", 0);
            response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
            response.addHeader("Cache-Control", "post-check=0, pre-check=0");
            response.setHeader("Pragma", "no-cache");
            response.setContentType("image/jpeg");

            String type = request.getParameter("type");

            Captcha captcha = new Captcha();
            if ("math".equals(type)) {
                captcha = captchaCreator.createMathImage();
            } else if ("char".equals(type)) {
                captcha = captchaCreator.createTextImage();
            }

            session.setAttribute(Constants.KAPTCHA_SESSION_KEY, captcha.getValue());
            out = response.getOutputStream();
            ImageIO.write(captcha.getBufferedImage(), "jpg", out);
            out.flush();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}